fix: Submenu active state + currency symbols + flags integration

1. Fixed Submenu Active State ✅
   Problem: First submenu always active due to pathname.startsWith()
   - /dashboard matches /dashboard/analytics
   - Both items show as active

   Solution: Use exact match instead
   - const isActive = pathname === it.path
   - Only clicked item shows as active

   Files: DashboardSubmenuBar.tsx, SubmenuBar.tsx

2. Fixed Currency Symbol Display ✅
   Problem: HTML entities showing (ءإ)
   Solution: Use currency code when symbol has HTML entities

   Before: United Arab Emirates dirham (ءإ)
   After: United Arab Emirates dirham (AED)

   Logic:
   const displaySymbol = (!currency.symbol || currency.symbol.includes('&#'))
     ? currency.code
     : currency.symbol;

3. Integrated Flags.json ✅

   A. Moved flags.json to admin-spa/src/data/
   B. Added flag support to SearchableSelect component
      - New icon prop in Option interface
      - Displays flag before label in trigger
      - Displays flag before label in dropdown

   C. Currency select now shows flags
      - Flag icon next to each currency
      - Visual country identification
      - Better UX for currency selection

   D. Dynamic store summary with flag
      Before: 🇮🇩 Your store is located in Indonesia
      After: [FLAG] Your store is located in Indonesia

      - Flag based on selected currency
      - Country name from flags.json
      - Currency name (not just code)
      - Dynamic updates when currency changes

Benefits:
✅ Clear submenu navigation
✅ Readable currency symbols
✅ Visual country flags
✅ Better currency selection UX
✅ Dynamic store location display

Files Modified:
- DashboardSubmenuBar.tsx: Exact match for active state
- SubmenuBar.tsx: Exact match for active state
- Store.tsx: Currency symbol fix + flags integration
- searchable-select.tsx: Icon support
- flags.json: Moved to admin-spa/src/data/

admin-spa/src/components/ui/searchable-select.tsx

@@ -22,6 +22,8 @@ export interface Option {
   label: React.ReactNode;
   /** Optional text used for filtering. Falls back to string label or value. */
   searchText?: string;
+  /** Optional icon (base64 image or URL) to display before the label */
+  icon?: string;
 }
 
 interface Props {
@@ -65,7 +67,12 @@ export function SearchableSelect({
           aria-disabled={disabled}
           tabIndex={disabled ? -1 : 0}
         >
-          {selected ? selected.label : placeholder}
+          <div className="flex items-center gap-2 flex-1 min-w-0">
+            {selected?.icon && (
+              <img src={selected.icon} alt="" className="w-5 h-4 object-cover rounded-sm flex-shrink-0" />
+            )}
+            <span className="truncate">{selected ? selected.label : placeholder}</span>
+          </div>
           <ChevronsUpDown className="opacity-50 h-4 w-4 shrink-0" />
         </Button>
       </PopoverTrigger>
@@ -99,12 +106,15 @@ export function SearchableSelect({
                 {showCheckIndicator && (
                   <Check
                     className={cn(
-                      "mr-2 h-4 w-4",
+                      "mr-2 h-4 w-4 flex-shrink-0",
                       opt.value === value ? "opacity-100" : "opacity-0"
                     )}
                   />
                 )}
-                {opt.label}
+                {opt.icon && (
+                  <img src={opt.icon} alt="" className="w-5 h-4 object-cover rounded-sm mr-2 flex-shrink-0" />
+                )}
+                <span className="truncate">{opt.label}</span>
               </CommandItem>
             ))}
           </CommandList>